Indeed, the quoted branching fractions of \(B^0 \rightarrow K^0 X(3872)\)  and \(B^+ \rightarrow K^+ X(3872)\)  decays by the review of particle physics (RPP) are [1]}
\({\cal B} [B^0 \rightarrow K^0 X(3872)] &=& (1.1 \pm 0.4) \times 10^{-4}, \\{\cal B} [B^+ \rightarrow K^+ X(3872)] &=& (2.1 \pm 0.7) \times 10^{-4},\) 
